With a factory pull weight of 3 pounds, the Timney Alpha Competition trigger answers the long call for a trigger that has the same feel and performance that matches the reliability of the Glock system by providing an improved trigger design that does not sacrifice any part of the Glock reliability. ONLY COMPATIBLE WITH STOCK GLOCK PISTOLS – INTENDED FOR COMPETITION USE ONLY *Compatible with G20/20 MOS/21/21MOS/29/30